Pull-socket.



H. HUBBELL.

PULL SOCKET. APPLICATION man NOV.29, 191s.

1 m flmo Patented June12, 1917(. *4?- J y- A? INVENTOR sits ' HARVEY HUIBBELL, or ianrnenronr, CONNECTICUT.

PULL-SOCKET.

mantel.

This invention relates to the class of sockets for incandescent electric lamps, illus-v trated and described in my Patent 565,541 dated Aug. 11, 1896, 693,799 dated Feb. 18, 1902, and 994, 518 dated June 6, 1911, and has for its objects to generally improve the construction and mode of operation of thesocket switch, and more especially to increase the current-carrying capacity of the switch without increasing its size,

or materially increasing the cost of production. This I accomplish by providing an operating lever, by means of which the operating plate or Wheel is actuated, and interposmg a tension spring between the operating lever and the operating wheel which is additionally wound by forward movement of the operating lever, and the effect of which is to cause the spring arms of the contact plate when they leave the shoulders I at the ends of the inclines on the lower insulating block to jump forward as well as inward, and thus produce a much quicker make and break than hasbeen possible with any pull socket heretofore produced.

In the accompanying drawing forming a part of this specification,

Figure 1 is an elevation of my novel pull socket, full size;

Fig. 2 'asection on the line 22 in Fig. 1, looking in the direction of the arrows;

'Fig. 3 a plan view onan enlarged scale of the switch with the socket shell removed;

Fig. 4: an elevation corresponding with Fig. 3;

Fig. 5 a section on the line 55 in Fig. l, looking in the direction of the arrows;

Fig. (iaplan View of the lower insulating block, the standards being in section on the line 6.-6 in Fig; 4 looking in the direction of the arrows;

Fig. 7 a detail elevation of the operating lever and the operating plate, detached; and Fig. 8 is a plan view of the contact plate,

detached.

' .10 denotes the socket shell, 11 and 12 the upper and lower insulating blocks, which are connected by standards 13 and 1 1, and

'15 the screwshell which is held in place by Specification of Letters Patent,

former Letters Patented June 12, 191?.

Application filed. November 29, 1916. Serial No. 134L211.

is provided with four inclines 17, each ter:

min atingin an abrupt shoulder 18. 19 denotes a plate lying on the surface of one of these inclines and having an extension which is turned under the base of standard 13 and is held in close engagement therewith by a screw 20 which secures said standard to the lower insulating block.

721 denotes a plate lying'upon the surface of the incline diametrically opposite-to the incline having plate 19, and having an extension which passes under a metallic cup 22 lying in a central socket 23 in the lower insulating block. It will be noted that the other two inclines 17 on the lower insulating block, diametrically opposite each other, are left uncovered, these I term insulating inclines. Cup 22 is secured in place by a screw bolt 24 which secures the center contact 25 in place, passes tl-irough the lower insulating block and the extension of plate 21, and the head of which lies in close engagement with the bottom of cup 22.

26 denotes the center post which is provided with a slotted angular head 27 and the lower end of which is seated in an insulating block 28 which is adapted to slide in cup 22 and is held, and with it the center post, in a raised position by a spring 29 which bears against the bottom of the cup and against the lower insulating block.

30 denotes the contact plate which is mounted to rotate on the center post, rests upon block 28, and is provided with shoulders 31 and with two downwardly extending spring arms 32 which are adapted to engage the inclines and shoulders on the lower insulating block. 33 denotes the operating plate or wheel which is mounted to oscillate on the'center post and is provided on its lower side'with lugs 34 adapted to engage the shoulders on the contact plate and on its upper side with a central hub 35 and with spaced apart lugs 36 and 37.

T he parts heretofore described do not differ materially from structuresin common ing a loose connection wit-h plate. The operating lever is provided on its lower side with a hub 39 corresponding with the hub on the operating plate and the connection between said lever and plate is by means of a lug 4O lying between and cooperating with lugs 36 and 37 on the operat ing plate. The operating lever is provided on its upper side with alug 41 which is engaged by a hook on the lower end ofan operating spring 42, the other end of which engages a hole 43 in the head of the center post. The upper insulating block is provided in its under side with an angular recess 44 which is adapted to receive the angular head of the cciiter post'loosely and hold it against rotation.

45 denotes a tension spring normally under tension, which 1s coiled about hubs 35 and 39, the ends of which are connected.

In the present instance, I have shown the switch as operated by a cord 46 the inner end of which is secured in an insulating bushing 47 at the outer end of the operating lever.

For convenience in description I have called part 26 a center post although in the present instance it is placed eccentrically to the insulating blocks. It is wholly immaterial, however, far as the present invention is concerned, whether the center post is placed concentrically with or eccentrically to the insulating blocks.

Standard 13 is provided with a binding screw 48, and standard 14. with a binding screw 49 to which conducting wires not shown are attached. The current passes from standard 13 to plate 19, to the contact plate, to plate 21 and through screw 24 to the center contact. Returning through the lamp, not shown, the current passes through screw shell 15 and through screw 16 to standard 14 and binding screw 49.

The operation is as follows: When the cord is pulled the operating lever will be moved forward. The tension spring is strong enough, however, to retain lug 40 upon the operating lever in engagement with lug 36 upon the operating plate during the first portion of the movement, the operating plate moving with the operating lever. As the spring arms of the contact plate ride up the inclines on the lower insulating block, however, the frictional engagement of the spring arms with the inclines will commence to retard the movement of the operating plate and lug 10 upon the operating lever will pass out of engagement with lug 36 the operating upon the operating plate and into en 'agement with lug 37 on said plate, by which engagement the operating plate will now be carried forward. The normal tension of the tension spring is increased by' the winding it receives when lug 40 passes out of engagement with lug 3(5 and into engagen-ient with lug 37, this being the position of the parts when the spring arms of the contact plate reach the shoulders at the ends of the inclines. When the spring arms leave the shoulders, the operating spring will act as in my said former patents to'force the spring arms of the contact plate downward into engagement'with either plates 19 and 21 or the insulating inclines. In my present structure, however, I have the additionaleffeet of the tension spring in making a quick make 'or break of the circuit. \Vhen the spring arms pass off the shoulders, the tension spring will cause the operating plate, carrying with it the contact plate, to jump forward until lug 36 on the operating plate engages lug 40 on the operating lever,so that instead of simply dropping down into engagement with the inclines through the action of the operating spring, the spring arms, through the cooperation of the tension spring with the operating spring, will jump forward and engage the inclines at a slight bases of the inclines. The result is, that no matter how slow the pull upon the cord may be, the instant the spring arms leave the shoulders they will be caused to jump forward through the action of the tension spring and the make or break will be much quicker than has heretofore been possible. The operating lever and the operating plate are returned to their normal position after each actuation by the operating spring-as in my said patents referred to. When the spring arms of the contact plate are in engagement with plates 19 and 21 the circuit will be closed and actuation of the operating lever and operating wheel as already described, will carry the spring arms off from plates 19 and 21, said arms dropping over the abrupt shoulders and. into engagement with the insulating inclines thus breaking the circuit simultaneously in two places.

'The next actuation carries the spring arms off from the insulating inclines and into engagement with plates 19 and 21 thus closing the circuit again.

Having thus described my invention, I.

vintermediate the operating lever and the opnaaeaea crating plate, the tension of which is increased by actuation ofthe operating lever.

2. In a structure of the character deactuated, and a tension spring, intermediate the operating lever and the operating plate, the tension of which is increased by actuation of the operating lever, said spring causing the spring arms of the contact plate to jump forward when they pass off the shoulders.

3. In a structure of the character described, in combination, a rotatable contact plate, an oscillatable operating plate by which the contact plate is actuated, and which is provided with spaced apart lugs, an oscillatable operating lever having a lug adapted to cooperate with the lugs on the operating plate, and a tension spring connected to said lever and plate and normally under tension, the tension of said spring being increased by actuation of the operating lever, substantially as described, for the purpose specified.

a. In a structure of the character described, in combination, a block provided with inclines each terminating in an abrupt shoulder, a rotatable contact plate having spring arms adapted to engage said inclines, an oscillatable operatin plate by which the contact plate is actuate an. oscillatable opcrating lever having a loose connection with the operating plateby which the latter is actuated, an operating spring acting on the operating lever, and a tension sprmg connected to the operating leverand to the operating plate and normally under tension,

the tension of which is increased by actua-tfi tion of the operating lever, substantially-as described, for the purpose specified.

5. In a structure 4 of the character de- I scribed, the combination, with a contact plate and ,an operating plate-by which the contact plate is actuated, ofan operating lever having a loose connection with theopcrating plate, an operating spring actingpn L i i the opera-tin lever, and a tension spring 111: termediate t e operating lever andthe op 'erating plate, the tension of which is in creased by actuation of the operating lever. 6. In a structure of the character described,

the combination, with a contact plate and] an operating plate bywhich the contact late is actuated, of an operating lever having a loose connection with the o crating plate, and a tension spring interme iate the operating lever and the operating plate, the tension of which is increased by actuation of the operating lever.

In testimony whereof I affix my signature HARVEY HUBBELL. 

